#!/usr/bin/env node

var pi = Math.PI;
var circle = function(radius){
  this.diameter=function(){
    return 2*radius;
  }
  this.circumference = function(){
    return pi*2*radius;
  }
  this.area = function(){
    return pi*radius*radius;
  }
}
console.log('.\n04-export-object\n',module);
module.exports = circle;
